Damper-regulator.



R. J. DAVIS, DAMPBR REGULATOR. APPLICATION FILED JAH. 3, 1910.

f 990,237. Patented Apr25,1911.

4 SHEETS-SHEET 1.

R. J. DAVIS. DAMPER REGULATOR. APPLIOATION FILED JAN. a. 1910,

Patentld Apr. 25, 1911.

4 SHEETS-SHEET 2.

R. J; DAVIS. DAMPBR REGULATOR. APPLIUATIUN IILED JAN. 3, 1910.

Patented Apr. 25, 1911.

4 BHBBTBSHBBT 3.

R. J. DAVIS. DAMPER REGULATOR. APPLIUATION rILBD JAN. 3. 1910.

Patented Apr. 25, 1911.

{SERBIE-SHEET 4.

ROBERT d'. DAVIS, OF CHICAGO, ILLINOIS.

DAMPER-REGULAT'OR.

Specification of Letters Patent.

Patented Apr. 25, 19M.

Application filed January 3, 1910. Serial No. 535,945.

To ali 'whom fit may concern:

Be it known that l', ltonnn'r J. DAVIS, a

- citizen of the United States, residing at Chicago, in the county ofCook and lState of Illinois, haveinvented certain new 'and useful4Improvements in Damper-ltegulators, oi which the following is aspecification.

This invention relates more particularly but not necessarily toimprovements upon the damper regulator of the particular type shown-anddescribed in my application for United States Letters Patent, Serial No.450,882, filed April 29, 1908, to which ret'- erence may be had for anunderstandinp,l o any feature common to the two devices which are shownherein but not described in detail, and the primary object ot' thepresent invention is to provide improved means whereby varying degreesof adjustment of the amper .may be obtained and the damper maintz'linedin its adjusted positions. f

A further object is to provide an improved device of this characterwhich will be simple, durable and cheap in construe tion and effectiveand etl'icient .in operation. To the attainment of these ends and theaccomplishment of other new and useful objects, as will appear, theinvention consists in the features of novelty in the construction,combination and arrangement of the several parts hereinafter more fullydescribed and claimed and shown in the accompany/'ingl drawingsillustrating an embodinicnt of the invention and in which-- Figure 1 isa' side elevation, partly in section, ot' an improved apparatus ot thischaracter constructed in accordance with the principles of thisinvention and showing the damper adjusting),` means in one position int'ull lines and in another position in dotted lines. Fig. Q is a detailelevation of a portion of the apparatus showing' the same in twopositions, one in full lines and the other in dotted lines. Fig. f3 isan en largcd detail sectional view on line iti-3 of Fig. Lt. Fig'. 4 isa top plan view of Fig. 3. Fia". tis a diagrammatic view showing' the`contacts and thc electro-responsive devices.

Fig. is a view of the regulating lever. Fig. `7 is a diagramnuitic viewshowing the circuits. Fig. S is a detail perspective view of (me ofthearmatures and catches which are controlled by the electro-responsivtifdevic, s.

ings and in the present exemplificationof the invention, the support forthe operating mechanism preferably comprises two spaced plates l() and11, which are held spaced from each other in any desired or suitablemanner, preferably by means ot' spacing members 12 arranged atconvenient points between the plates and which are connected by theirextremities to the plates in any Suitable manner. Jonrnalcd adjacenteach extremity of these plates or supports and extend` ing transverselythercacross are shafts 13, lfl, to which are respectively securedsprockcts l5, 1G, by means ot' suitable ratchet mechanism comprisinga.dog 17 which cooperates with a shouldered portion 18 on the shaft andwhich dogs are held in position to engage the shoulders by means ofsuitable elastic members 2t), such as springs or the like. This ratchetmechanism will perniit the respective sprockets 15, 16, to rotate freelyabout the respective shafts 13, l-fi in one direction but when thesprockets are rotated in the opposite direction, the ratchet mechanismwill lock the sprockets -to thc shafts so that the shafts will berotatcdby the sprockets.

The shafts 13, 14, are of a length to project beyond one of the platesor supports comprising' the frame, preferably the front plate or support10, as shown more clearly in VFigs. l and at, and secured respectivelyto the projecting extremities of those shafts arc arms 21, 22 and thesearms are pro vided with a slot'll through which the extrcmity of therespective shafts project and a fastening device is secured to the endof the sha'lts ior preventing displacement of thc arms. The slots E2C-'lpermit the arms to be adjusted laterally with respect to the sha tits soas to vary the movement of the damper4 ,in a manner which will bcpresently set forth. The arms are respcctivcly provided with laterallyprojecting pins or extensions 2i, Pivotally supported by one of thcprojections, pretcrably the projection Q5, on au ojwratirug lever QG,the body portion of which provided with an elongated slot 27, whichextends sulistantially the entire length of the lever. The otherprojection Q4 on the arm 21 extcnds'into the slot 2T so that the leverQG may be freely moved longitudinally with respect to the pin orprojection 24 when the arm 22 is rotated, so that the projection 24ewill serve as a fulcrum by the arm 2Q is by means of the apertures 23anda hookedv extremity, is a llexible member 29 preferably in the formof a chain or the like.'

The apparatus thus far described is preferably supported from anoverhead support 30 such as the ceiling of a room by means of suitablehangers V31. The other extremity of the iiexible member 29 is connectedto the door or damper 32 of the furnace 33. A similar flexible member 34is connected by one extremity to the lever 26 by engaging in any one ofthe apertures on the opposite Side of the lever. This flexible mein'-ber 34v is preferably arranged so as to pass over overhead pulleys 35preferably secured to the support 30 and the free extremity of theflexible member is connected toa damper 36 of the furnace.

From the above it is thought that this im` proved construction Will beclearly understood, and with the mechanism thus far described itisthought, that the operation will also be clearly understood but brieflystated it is as follows: Assuming the parts to be in the position shownin full lines in Fig. 1, and motion is imparted to the shaft 13 'torotate the latter, the arm 2l will be rotated and will raise the lever26 from the position shownv in full lines tov that' shown in dottedlines. During this raising move'- ment, the lever will rock about itspoint of connection 25 with the arm 22 as a fulcrum, and it will draw upon the lexi ble member 29 to further open the door Aor damper 32. Att-hesame time tension will be releasedfon the flexible member' 34, whichWill permit the damper 36 to close by the Weight of the damper and theportion of the flexible member between t-he damper and.one of thepulleys 35. Assuming the parte to be in the position shownin full linesin Figs. 1 and 2, the operation will be the same with this exception,hat if motion is imparted to the arm 22 instead of the arm 21 thelateralprojection 24 on the arm 21 will'serve as a fulcrum for the lever 26 andwhen the arm 22 is rotated, the lever Will 'be moved about the fulcrum24 to rock the lever from the 'position shown in full'lines in Fig.' 2to that shown in dotted lines in the same figure.

This movement of the lever will release they tension ion the flexiblemember 29 and per-l "init the damper or door 32 to close by the Weight'thereof and at the same time will` dravv Aupon y'the ilezrible member34 to open lthe damper "t'trill therefore be apzvpar-A ent that thedampers *32, 36, may be adjusted to varying degrees and maintained intheir adjusted positions according to which of the arms 21, 22 isrotated. The rotation of these arms 2l, 22 is controlled entirely by thetemperature of the room to be heated and in a manner as Will beclearlysetfforth.

- The arms 21, 22-maybe rotated in any suitable manner but arepreferably rotated and operate in a manner similar to the operation' ofal gravity motor and for this ,purpose weights 37, 38, are provided, one

for each of the sprockets 15, 16, and these weights are operativelyconnected with the respective sprockets. by means vof flexible members39, 40, preferably in the form Aof chains or the like, one extremity 4ofeach of which is secured to one of the Weights and the body portions ofthe chains or flexible members pass over the respective sprockets -15,16, as shown diagrammatically in Fig.'

3. The chains also pass respectively through guides 4142, which arepreferably held in position between the supports 10 and 11 by means ofthe connecting members -12, as

shown more clearly in Fig. 3 and. secured to the flexible members arestops 43, 44, preferably in the form of rings or the like. These stops43, 44 are adapted to respectively engage the guides 41, 42, when the`Weights 37, 38 are respectively adjacent the limit of their downwardmovements. so as to stop the shafts 13, 14, at predetermined positionsto prevent the completion of the current through the electro-responsivede` vices to prevent the operation of the motors and in this mannerthestops 43, 44 seiweas' circuit breakers in the manner which 'will beset forth.

The shafts 13, 14may be controlledin anyv desired or suitable manner, sothat the Weights Will -impart intermittent rotation thereto and forthis-purpose arms 45, 46 are secured respectively to the shafts n 13,14. Each of the arms is secured t-o the respective shafts intermediateits extremities and its extremities are preferably flattened as at 47,48, shown more clearly in Figs. 1 and 4. Locking dogs 49, 50 arerespectively provided for the arms 45, 46, and are pivotally supportedon thex main supporting members of the mechanism. 4G, and theirrespective locking dogs 49, 50, is arranged adjacent the outer' face ofeach of the supports 10, 11, so that the mechanism may be compactlyarranged and at thesame time means may be provided'for controlling therotation of the respective shafts. Each of the dogs 49, 50 is providedwith a toothed portion 51, as shown more clearly in Figs.

One of these arms 45, l

1 and 3', which portions are preferably in the form of segments and anarm 52 provided tion 53 thereof will' engage the respective tation.

lto release the arms 52 the tendency of the be compa ctly arranged.

toothed portibns'51 of the arms. These arms 52 are provided forcontrolling the movement of the locking dogs 49, 50, and

a catch 55 is provided for each ofthe arms 52 and is so arranged thatwhen the respective locking dogs 49, are in engagement with therespective arms 45, 46, the freey extremities of the harms will beenaged by lthe respective catches to lock t e respectivev shafts 13, 14against ro- When the catches 55 are shifted respective Weights 37, 38will be to rotate the respective shafts 13, 14, which in turn tend tomove thev arms 45, 46 against the tension of the dogs 50 and the dogs 50will in turn'move the arms 52 through the medium of the connections51,53, so that the shaft will rotate the' movement of the dogspermitting the arms to escape. As soon as the dogs 50 move out ofengagement with the respective arms 45, 46, the dogs will be immediatelyreturned to their normal posit-ions after the ends ofthe arms havepassed out of engagement therewith by the Weight of the arms 52 and inpositions to be engaged and retained by the catches 55.

Any suitable means may be provided for controlling or shifting thecatches 55 and for this purpose electro-responsive devices 56, 57, areprovided. These electro-responsive devices are preferably in the form ofmagnets, as shown more. clearly in Fig. 3 andare arranged in pairs ,andsupported in any desired or suitable manner, preferably vby means ofinsulating material |58 held in position by means of the supports 10 and-11 and in such a position that the electro-- responsive devices willstand between the shafts 13 and 14 so that the mechanism may Coperatingwith these electro-responsive devices are armatures 59, 60, to `whichthe catches 55 are respectively connected, so that when one or the otherpair of electro-responsivc devices is energized, the respectivearmatin'e will be attracted and this movement of the armatro-responsivedevices may be denergizedY -befere the arms 52 reach their normal pos1-tion or positioned to hold the dogs 5() in operative positions withrelation to then' `respective arms 45, 4.6. in which event, the

catches will yield to the arms52 as the latter reach positions to beengaged and held by the catches, this yielding movement being permittedby means of the elastic members 61. t i

The speed of rotation of the shafts 13, 14.

force, as will be clearly understood.

is controlled by means of suitable governors which preferably compriseweighted members 62 which are secured for-pivotal move? `13, 14. Theweighted members 62 are supported for rotation within a housing 66.

which forms an annular wall and the weighted members are provided withgripping surfaces 67 which are thrown out into engagement with the wall66 by centrifugal The gears are preferably mounted loosely upon therespective shafts 13, 14, and in order to permit the free rotation ofthe gears with relation to their respective shafts in one direction andto lock the gears to the shafts when the gears are rotated in theopposite direction, suitable locking mechanism may be provided,preferably in the form of a dog or cam 68, which is pivotally snpportedas at 69 upon the gear '65 and is adapted to be forced into engagementwith a portion of the respective shafts 13, 14, preferably by means ofan elastic member 70 in the form of a spring. rl`his independent motionof the gear 65 is provided in order that the mechanism will notbc jarredby suddenly arresting the descent of the weights 37, 38, and alsopermits the governor to gradually stop as the momentum of the governortends to rotate the gear 65 after the shaft 13 has been stopped.

Secured to cach of the shafts 13, 14, is a sleeve 71, 72. The sleeve`71. is provided with'laterally projecting pins 73, 74, and the sleeveA72 is provided with corresponding pins or projections 75, 76. Supportedby the support 5S is a common contact 77, shown more clearly in thediagrannmitic view in Fig. 5. This contact 77 projects beyond each sideof the support 58 and its extremities 79.171), terminate respectivelyadjacent the sleeves 71, 72, and in such vpositions that when therespective shafts V13 14, are rotated a sullicient distance. the respecti\' l j'n'ojections 73. 75, will engage the extremities 7S, 79. of tlnlcontact 77. These extremities of the contact are jn'e'l'erably flexihleso as to vicld to permitI the pins or projections to pass butl aresutliciently stiti' to form a good contact for th circuit. Sccnrcd alsoto the supports 5S are contacts 80, S1, onev of which projects beyondeach side of the support and are respectively parallel with and locatedprofi lably in the .same plane with the extrel'nities 78, 79 of thecontact 77. These contacts SO, S1 also terminate respectively adjacentthe sleeves 71, 7*., so as to he engaged res|wctively by the respective-sleeves are preferably arranged so as to be disposed in oppositedirectionsv from each other, that is, so that Whenfone of thepins on thesleeves is in engagementv with its respective contact, the ,-other*l pinon the same sleeve Will be out of engagement With .its contact. Contacts82, 83 are also secured to the support58 xand are arranged to projectbeyond opposite sides thereof. These contacts are preferably spacedabove or arranged in a higher plane from the plane of the contacts 78,80, and 79, 81, and are preferablyslightly longer than-the adjacentcontacts. The extremity of the respective contacts 82, 83 engage andrest .upon the respective sleeves/71, 72, which lattei` are insulated bysuitable insulating material 84 from ythe crespective shafts 13, 14.

The electro-responsive devices 56 are connected in series and one end ofthe Winding is connected as at'85 to the contact 83 and the other end ofthe winding is connected as at 86 to a binding post 87. Th.-electro-responsive devices 57 are also connected in series and one endof the Winding is connected as at 88 to the contact 82. The other endofthe winding is connected as at 89 to binding post 90.

These electro-responsive devices 56., 57

are controlled by means of thermostatic bars 91, 92 which are securedtogether to operate in unison and the free extremity of these bars areadapted to move respectively between contacts 93, 94 and 95, 96. One ofthe contacts, preferably the contact 93 of the 1 thermostatic bar 91 isconnected by means of a conductor 97 to a binding post 98 which Y inturn has connection with the contact 80. The contacts 94,96 arelelectrically connect ed and are in turn connected by means of aconductor 99 to a binding post 100, which latter has connection With acontact 77 and the ends 78, 79 thereof. The other Contact 95 of thethermostat is 'connected by means of a conductor 101 to a binding post102, which in turn is-e'lectrically connected With the contact 81.- Thethermostatic bar 91 has connection by means of a conductor 102 to oneside of a battery cell 103 and the binding post 90'is connected to theother side ofthe `cell by means of a conductor104. The otherthermostatic'bar 92 is connected by means of a conductor 105 to one sideof a battery cell l06and the binding post 87I is connected by means of aconductor 107 to the other side of the battery cell 106. The specificconstruction and operation,

however, of these thermostatic bars 91, 92,-

forms no part of, the subject matter of the present invention, but thesubject matterA of my application Serial Nor/495,902, led May 4, 1909.Suffice it to say that when the tem-I4 I quently the do '49. This willstop the rotation o perature 1in the room to be heated increases ordecreases, the thermostatic bars Will move respectively into and out Aofengagement of its .coperatin contact points' `to energize thecorrespondgmg electro-responsive devices 56, 57. These thermostatic barsare set so' as to operate on slightly different temperaturesA and arearranged preferably'vvithin 'a casing 108 (see Fig. 1) Which is securedor supported by means of the Wall 109 of the room so that the conductorsmay be loc cated Within the Wall usual manner. lv.

"Assuming the thermostatid bars as shown in diagram in Fig. 7 to be inthe position as shown in full lines, the pin 73 on .thel sleeve 71 inengagement lwith the contact 78 and the Weights 37, 38'elevatedftd thefull linposition as shown in' 1,;and a variation of `the temperature ofthe room occurs the operation-*Will becs folljWs: If the temperature ofthe in the ordinary and `porn decreases, the'th rmostatic barl 91 Wilmove from the positi n i shown in full lines in diagram in Fig. 7 to theposition shown in dotted lines which will complete the circuit throughthe el ctroresponsivey devices 57 by means of the fol-` lowing path;from oneside of the battery cell 103 through the conductor 1023, thermo`static bar 91, contact 94, conductor 99, binding post 100, contact 78,pin 73, sleeve 71, Contact 82,conductor88, through theelectro-responsive devices 57, conductor 89, binding post 90, conductor104, back to the other-side ofthe battery cell 103.,v As soon .as thecircuit is completed in this'manner,

the electro-responsive devices `57 will be energized and Will attractthe armature 60, thereby shiftingr the catch 55- and `releasing the arm52. When the arm52 is thus released, the Weight 37 will valso bereleased and will start to descend. As the weight descends, the shaft 13will be rotated as in the manner already set'forth. The instant theshaft 13Vstarts to rotate, the arm 45 Whichis secured thereto and whichhas been released Will pass out of engagement vwith the dog- 49 and themoment the extremity of the armapasses the dog', the gravity of the arm52 will move the dog 49 into the'path of movement of the 4otherextremity 47 bfwthe farm 45 so as to be engaged by the arm to arrest themovement;- of the shaft 13. Just a's soon as the shaft 13 commences .torotate, the pin 73 will pass out of engagement with the contact 78 andthereby break `the circuit through the electro-responsive devices 5.7which Will dexier 'ze the latter. The elastic member 61 wil then movetheA armature 60 to its-normal position `to set the catch .55 tolock-the arm l52 and conse 49.l This operation takes' place beforeapt 'e3-other,j extremity of the y arm 45 reaches a position to engagclthellote s a 13 and arrest the descent of the weight 37, thejar caused by thesudden arresting of the weight being taken up by means et' the governorand the loose connection between the gear 65 and the shaft 13 in themanner already fully explained. ,Assuming the parts to be in the initialposition as above set forth and if the ten'iperatnre of the roomincreases the thermostatic bar 92 will move into engagement with contact9G to control the circuit from the battery 10G through theelectro-responsive devices 56 in a similar manner.

The pins 7 Tet, on the sleeve T 1 and also the pins T5, 76, on thesleeve 72 are so arranged with respect to each other and with respect tothe arms L15, 4G, that when one of thepins moves away from its Contact,the other pin will be in engagement with its respective contact when themovement of the sha't't is arrested, so'that when the temperature in theroom varies to such anextent as to cause the thermostatic bar 91 to moveinto engagement with the Contact 93, the circuit will be again completedthrough the electro-responsive devices.57 to still 'further adjust thedempers.

'lhe operation just above described applies equally as well to thethermostatie bar 92 and the electro-responsive devices 56.

'ln order to brealt the circuit through the mechanism and to render themechanism inoperative when'the weights 37,38 approach the limit ot theirdescending movements, the stops 43 and it-1# are provided. rl`hesestopsare so arranged that just as ,the weights reach their limits, they willengage the guides or stops 41. 42, and thereby stop the rotation oi theshafts.l 13, 111-. These stops 43. 4t. are .also so arranged that whenthe respective shafts 13, 14, are arrested` b v 'the engagement 'ot thestops with the guides. #,l-l. 42, the pins 73, 74, on the sleeve 71, andthe pins 75, 7G on the sleeve 72 will be held ont ot' engagement withthe contacts 78, S0, and 79, 81, so that in the event ot' the operationot' the thermostatic bars 91, 92, with the parts in the position abovedescribed, the energizatien ot' the electro-responsive devices would.not set the mechanism in oj'ieration and the parts will thereby heprotected.

The point of attachment ot the llexible connections Jfrom dratts 32, 3G.to lever 2G may be made at any one ot' the series ot points Q8 alonglever 26 so as to render the drafts more or less open when in theintermediate position in order that sutlicient air may be admitted tothetre to maintain a comparatively even tcn'iperatnre and thus avoid afrequent change ot the dralts` to either ofthe other positions.

In order that the invention might be fully understood` the details otthe. 'foregoing embodiment thereof have. been thus speciticallydescribed, but

1. In a damper regulator. the ,combination oi a regulating lever, aplurality of shiftable fulcrums with which the lever has engagement. aconnection between the lever and the doei' or damper of a heater,mechanism 'tor shifting either of the fnlcrum points to rock the leverabout the other fulcrmn point tor adjusting the door or damper. andmeans operatively related to the said mechanisms for rendering one ofthe mechanisms activ.l and for maintaining the other ot saidn'iechanisms inactive.

2. 1n a damper regulator, the combination ot" a regulating lever. aplurality of shit'table fulcrums with which the lever has engagement. aconnection between the lever and a door or damper of a heater,mechanii-'m 'for shifting either of the fulcrum points to rock the leverabout the other fulerum point i'or adjusting the door or damper. andelectro-responsive means operatively related to the said mechanisms forrendering one ot' the mechanisms active and Yfor maintaining the `otherof said mechanisms inactive.

il. In a damper regulator, the combination ot a regulating level'. aplurality of shi't'tahle l'ulcrui'ns with which the lever hasengagement, a connection between the lever and a door or damper of aheater, mechanism t'or shitting either ot' the tulcrum points to rockthe lever about the other fulcrum point 't'or adjusting the door ordamper, and means controlled by the temperature of the roomnml-operatively related to the said mechanisms for rendering one of themechanisms active and for.maintaining the other ot said mechanismsinactive.

l. ln a damper regulator, the combination ot a regulating lever.' aplurality of shittable tulcrums with which the lever has engagement, aconnection between the lever and the door or damper ot a heater,mechanism 4t'or shitting either oi the tulerum points to roch the leverabout the other fulcrum ypoint tor adjusting the door or dainper. andmeans operatively connected with said n'ieehanisms tor automaticallyrendering one ol tbe said mechanisms active and ttor.nniintaining theother of said mechanisms inactive.

5. ln a damper regulator. the combination ot a regulating lever.changeable fnlcrnms l'or the lever. a connection between the lever and aheater damper or door. mechanism individual to each oi' the t'nlcrumsfor shifting one ot the t'nlcrnmsl with respect to the other to rock thelever about the said other l'nlcrnm l'or vary'ingathe adjnstment ot'thel door or damperaand meansl common to said mechanisms lor controllingthe operation of the latter.

t3. l'u a damper regulator. the combination ot a regulating lever,changeable fulernn'is door or damper, and means common to said for thelever, a connection .between the lever mechanisms and controlled bythetemperature of the room for controllingthe opera.

tion ofthe latten 7. In a damper regulator, the combination of .aregulating lever, a movable support to.

which the lever is pivotally connected, a

' second support for the lever and'with which the lever has a slidingconnection, a connection between the lever and a door or damper of aheater, actuating mechanism individual tothe supports for moving one ofthe latter to rock the lever about the other support as a ulc'rum, andmeans rforcontrolling the operation of the said actuating mechanism.

'8. ln a damper regulator, the combination lof a vregulating lever, amovable support to which Vthe lever is pivotally connected, said leverbeing provided with a slot in its body, a second supportfor the leverhaving a por`- tion projecting into the slot to form a slidingeonnectionwiththe lever, mechanism' for rotating either of the supports to rockthe lever about the other as a fulcrum,a

-connection between the lever and-a door or damper of. a heater, andmeans controlled by the'temperature of the room for actuatingsaid'lmechanism'to adjust the said door or damper.

9. In e damper regulator, the combination of a regulator lever, amovable support to whichl the lever is pivotalljI connected," a

second support'for the lever and with which,

the lever has a sliding connect-ion, mecha! nism individual to thesupports for moving one of the respective supports to rock the leverabout the other as a fulcr'um, a. ilexible member connected with a dooror damper of'a heater and also with the lever intermediateits points ofsupport, whereby the operation of the lever -will adjust the door ordamper, -means whereby the 'point oi? connection of the exible memberwith the le- `'tion of a'regulating lever, a movable support to whichlthe lever is pivotally connected, a second movable support for the'lever and with which the lever has asliding connection, a connectionbetween the lever and a door or damper' of a. heater, actuatingmechanism individual to the supports for moving one or" the. respectivesupports to rock the lever about the other support as a fulcrum, meansfor controlling the operation of the said actuating mechanismsi meansfor locking the lever in any oit`4 its adjusted positions, and means torreleasing the lever. -f

1 1. In a damper regulator,'the combination of a pair of shafts, a crankn each of said shafts, a connection between the cranks, said connectionpermitting a free and independent movement of Veach shaft andferank, aconnection between the first said connection and a door or damper of aheater, mechanismi'or moving each crank to adjust the door-or damperandmeans .for controlling the operation of said mechanism.

l2. In a damper regulator, the combina. tion of a pair of shafts, acrank on -each of said sliafts,' a connection between the cranks, saidconnection permitting a' free and independent movement of each shaft andcrank with respect tothe other shaft and crank, a connection adjustablysecured to the first said connection and arranged between saidconnection and the dooror damper of a heater, mechanism for moving eachcrank to adjust the door or damper, and means for controlling theoperationof saidvmechanism. i l I' In testimony whereof I have signed myname' to this specification, in the presence of two subscribinWitnesses, on this 30th day'of December D. i909.

RQEER DAVIS.

Witnesses: J., H. declinar, Jr.,- C. H. Sani/r.

